struct UserClass {
var babyName: String!
var babyHeight: String!
var babyWeight: String!
var babyURL: String!
var uid: String!
var reference:DatabaseReference!
var key: String!
init?(snapshot: DataSnapshot?) {
guard let value = snapshot?.value as? [String:AnyObject],
let uid = value["uid"] as? String,
let babyName = value["BabyName"] as? String,
let babyURL = value["BabyURL"] as? String,
let babyHeight = value["BabyHeight"] as? String,
let babyWeight = value["BabyWeight"] as? String else {
return nil
}
self.key = snapshot?.key
self.reference = snapshot?.ref
self.uid = uid
self.babyURL = babyURL
self.babyName = babyName
self.babyHeight = babyHeight
self.babyWeight = babyWeight
}
func getuserData() -> String {
return ("BabyName = \(babyName)")
}
}
func fetchCurrentUserInfo() {
var currentUserRef = Database.database().reference().child("Users").child("\(userID)")
handler = currentUserRef.queryOrderedByKey().observe(DataEventType.value, with: { (snapshot) in
print("User data = \(snapshot.value)")
let user = UserClass(snapshot: snapshot)
print(user?.babyName)
self.babyName.text = user?.babyName
})
}
I am getting user data but not user.babyName. How can I fix this?
May be this will help you, as the db structure is not mentioned in question. but you have to iterate children one by one and then use for loop to fetch the exact data from firebase.
reference = FIRDatabase.database().reference()
reference.child("Users").queryOrderedByKey().observe(DataEventType.value, with: { (snapshot) in
if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot] {
for snap in snapshots
{
let userId = child.childSnapshot(forPath: "userID").value! as! String
print(userId)
}
}
})
Related
I'm trying to retrieve data from a Firebase RealTime database, in order to put it on a list which will be used to display data on a TableView.
My problem is that even if I get some data, I haven't enough knowledge to access on arrays and other swift objects. Perhaps, I'm not using the good way to do what I want.
Here is an example of a row on Firebase :
Here is a function written in Swift in which I'm trying to build a list for each row object.
func displayStationsUsingSearch(){
let station = self.stationName
let CP = Int(self.searchedCP!)
// create searchRef or queryRef you name it
let stationsRef = Database.database().reference().child("Stations")
stationsRef.observeSingleEvent(of: .value, with: { (snapshot) in
print(snapshot)
/*if snapshot.value is NSNull {
print("not found")
} else {
// yes we got the user
let id = snapshot.value as! Int
}*/
for child in snapshot.children {
stationsRef.queryOrdered(byChild: "marque")
.queryEqual(toValue: "TOTAL ACCESS")
.observe(.value, with: { snap in
if let dict = snap.value as? [String: AnyObject] {
/*self.stationItem!.nomStation = dict["nomStation"] as! String
self.stationItem!.adresse = dict["adresse"] as! String
self.stationItem!.codePostal = dict["codePostal"] as! String
self.stationItem!.ville = dict["ville"] as! String
self.stationItem!.marque = dict["marque"] as! String
self.stationItem!.pays = dict["pays"] as! String
self.stationItem!.commentaire = dict["commentaire"] as! String
self.stationItem!.coordGPS = dict["coordGPS"] as! String*/
print(dict["nomStation"] as! String)
}
})
}
})
}
The lldb on Xcode workspace displays that :
Printing description of child:
Snap (-LdA6X8CfNY3bsPni31U) {
"DIESEL EXCELLIUM" = 0;
"DIESEL ULTIMATE" = 0;
GAZOLE = 0;
GPL = 0;
SP95 = 0;
"SP95 E10" = 0;
SP98 = 0;
SUPER = 0;
adresse = "RN1 Direction Moisselles";
codePostal = 95570;
commentaire = "";
coordGPS = "";
createdAt = "31/07/2018";
heureDebut = "";
heureFin = "";
id = 0;
marque = ESSO;
modifiedAt = "23/04/2019 18:53";
nomStation = "ESSO Moisselles";
pays = "";
saufJour = "";
services = "";
typeRoute = "";
ville = Moisselles;
}
(lldb)
Could you please help me to retrieve data on a list that I could append to display data on tableview ? Thank you.
Try something like that:
Database.database().reference()
.child("Stations").
observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value as? [String: Any] else {
return
}
var stations = [Station]()
for (key, value) in values {
guard let station = value as? [String: Any],
let adresse = station["adresse"] as? String,
let codePostat = station["codePostat"] as? String else {
continue
}
stations.append(Station(adresse: adresse, codePostat: codePostat))
}
// if you have some completion return retrieved array of stations
completion(stations)
})
struct Station {
private let adresse: String
private let codePostat: String
init(adresse: String, codePostat: String) {
self.adresse = adresse
self.codePostat = codePostat
}
}
You can use a swift Class Instead.
Swift Object:
import Foundation
class FirebaseTransactionData : NSObject{
var customer : FirebaseTransactionDataCustomer!
var driver : FirebaseTransactionDataCustomer!
var status : String!
init(fromDictionary dictionary: [String:Any]){
status = dictionary["status"] as? String
if let customerData = dictionary["customer"] as? [String:Any]{
customer = FirebaseTransactionDataCustomer(fromDictionary: customerData)
}
if let driverData = dictionary["driver"] as? [String:Any]{
driver = FirebaseTransactionDataCustomer(fromDictionary: driverData)
}
}
}
class FirebaseTransactionDataCustomer : NSObject{
var lat : Double!
var longField : Double!
init(fromDictionary dictionary: [String:Any]){
lat = dictionary["lat"] as? Double
longField = dictionary["lng"] as? Double
}
}
Firebase Method
ref.observe(DataEventType.value, with: { (snapshot) in
let value = snapshot.value as? [String:Any]
let datt = FirebaseTransactionData(fromDictionary: value!)
print("snapshot \(datt.status!)")
print("snapshot \(datt.customer.lat!)")
})
How can I get the data that in Struct model in new viewController
I got a viewController when i print the var in Struct model it appeare just fine.
I created New viewController trying to get the same data in otherview of that struct model but when i print it it give me nil
I tryied to make the model equal to the new model in the new viewController
MessageController View
var messages = [Message]()
var users = [Contact]()
var messagesDicionary = [String: Message]()
var testMSG : Message?
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let message = self.messages[indexPath.row]
let chatPartnerId = message.chatPartnerId()
let ref = Database.database().reference().child("users").child(chatPartnerId)
ref.observe(.value) { (snap) in
if let dictinoary = snap.value as? [String: AnyObject] {
guard let email = dictinoary["email"] ,let profileimage = dictinoary["profileimage"], let userid = dictinoary["userid"], let username = dictinoary["username"] else {
return
}
var user = Contact()
user.userid = chatPartnerId
user.userid = chatPartnerId
let userValue = Contact.init(email: email as? String, username: username as? String, profileimage: profileimage as? String, userid: userid as? String)
self.users.append(userValue)
self.showChatControllerToUser(user: userValue)
print(message.receivername)
}
}
}
result of Print Optional("Omar")
ChatMessagesController View
var user :Contact?
var users = [Contact]()
var message: Message?
var messagesArray = [Message]()
func observeChatMessages() {
guard let uid = Auth.auth().currentUser?.uid else {
return
}
let userMessagesRef = Database.database().reference().child("usersmesssages").child(uid)
userMessagesRef.observe(.childAdded) { (snap) in
let messageId = snap.key
let messageRef = Database.database().reference().child("messages").child(messageId)
messageRef.observeSingleEvent(of: .value, with: { (snapshot) in
guard let dictionary = snapshot.value as? [String:AnyObject] else {
return
}
let text = dictionary["text"] as? String
let receiverid = dictionary["receiverid"] as? String
let senderid = dictionary["senderid"] as? String
let time = dictionary["timestamp"] as? TimeInterval
let senderName = dictionary["sendername"] as? String
let receiverName = dictionary["receivername"] as? String
self.messagesArray.append(MessageValue)
self.chatTableView.reloadData()
print(self.message?.receivername)
})
}
}
result of print NIL
Message Model
struct Message {
var text: String?
var receiverid: String?
var senderid: String?
var timestamp: TimeInterval?
var sendername: String?
var receivername: String?
func chatPartnerId() -> String {
return (senderid == Auth.auth().currentUser?.uid ? receiverid : senderid)!
}
}
I tried to make in MessagesController
let chatMessage = ChatMessageController()
chatMessage.message = self.testMSG
I have been refactoring my code and now I'm having trouble with the posts.
Whenever I add a new post to the collection view, it is being added in a random cell and out of order, instead of in the first post.
I know the reason is the fetchuser function and from what I'm being told due to the asynchronous loading, but don't know what to do in order to correct this.
Could someone help me figure out what to do so that my posts are added in the first cell?
#objc func observePostsAdoption() {
let postsRef = Database.database().reference().child("posts")
postsRef.queryOrdered(byChild: "postType").queryEqual(toValue: "adopt").observe(.value) { (snapshot) in
var tempPost = [Posts]()
for child in snapshot.children {
if let childSnapshot = child as? DataSnapshot {
let dict = childSnapshot.value as? [String: Any]
let newAdoptiondPost = Posts.transformPost(dict: dict!)
//This will look up all users at once
self.fetchUser(userid: newAdoptiondPost.userid!, completed: {
tempPost.insert(newAdoptiondPost, at: 0)
DispatchQueue.main.async {
self.postsadoption = tempPost
self.adoptionCollectionView.reloadData()
self.refresherAdoption.endRefreshing()
}
})
}
}
}
}
func fetchUser(userid: String, completed: #escaping ()-> Void ) {
Database.database().reference().child("users").child(userid).observeSingleEvent(of: .value) { (snapshot) in
if let dict = snapshot.value as? [String: Any] {
let user = UserProfile.transformUser(dict: dict)
self.users.insert(user, at: 0)
completed()
}
}
}
Here's my Post Struct
class Posts {
//UserView
var uid: String?
var author: UserProfile?
var timestamp: Date?
var userid: String?
func getDateFormattedString() -> String {
let formatter = DateFormatter()
formatter.dateFormat = "MMM d, HH:mm"
return formatter.string(from: self.timestamp!)
}
//Image
var photoUrl: URL?
//PostInformation View
var city: String?
var municipality: String?
var name: String?
var breed : String?
var phone : String?
var address : String?
var petType: String?
var genderType: String?
var comments: String?
}
extension Posts {
static func transformPost(dict: [String: Any]) -> Posts {
let post = Posts()
//Post Picture
let photoUrl = dict["photoUrl"] as? String
post.photoUrl = URL(string: photoUrl!)
//INFO POSTS
post.userid = dict["userid"] as? String
post.city = dict["city"] as? String
post.municipality = dict["municipality"] as? String
post.name = dict["name"] as? String
post.breed = dict["breed"] as? String
post.phone = dict["phone"] as? String
post.address = dict["address"] as? String
post.comments = dict["comments"] as? String
post.petType = dict["petType"] as? String
post.genderType = dict["gender"] as? String
let timestamp = dict["timestamp"] as? Double
post.timestamp = Date(timeIntervalSince1970: timestamp!/1000)
return post
}
}
If you already have the posts ordered by post type you can just do sorting depending on the timestamp. For example
#objc func observePostsAdoption() {
let postsRef = Database.database().reference().child("posts")
postsRef.queryOrdered(byChild: "postType").queryEqual(toValue: "adopt").observe(.value) { (snapshot) in
var tempPost = [Posts]()
for child in snapshot.children {
if let childSnapshot = child as? DataSnapshot {
let dict = childSnapshot.value as? [String: Any]
let newAdoptiondPost = Posts.transformPost(dict: dict!)
//This will look up all users at once
self.fetchUser(userid: newAdoptiondPost.userid!, completed: {
tempPost.insert(newAdoptiondPost, at: 0)
DispatchQueue.main.async {
self.postsadoption = tempPost
self.postsadoption.sort { (p1, p2) -> Bool in
return p1.timeStamp?.compare(p2.timeStamp!) == .orderdDescending
}
self.adoptionCollectionView.reloadData()
self.refresherAdoption.endRefreshing()
}
})
}
}
}
}
With that the posts adoption array will be sorted depending on the timestamp that you have.
How do I change the fetchAllPosts function in my networking file and in the homeviewController so that I only get posts from the database that match the UID of the user I’m following with the post.UID, so my feed is filled with posts of users I follow?
Here is the reference showing how I make a new follower in the database:
let followingRef = "following/" + (self.loggedInUserData?["uid"] as! String) + "/" + (self.otherUser?["uid"] as! String)
Here is the post structure in the Firebase database
posts
-Ke4gQKIbow10WdLYMTL (generated key)
postDate:
postId:
postPicUrl:
postText:
postTit:
type:
uid: looking to match this
Here is the current fetchAllPosts function in the networking file
func fetchAllPosts(completion: #escaping ([Post])->()) {
let postRef = self.dataBaseRef.child("posts")
postRef.observe(.value, with: { (posts) in
var resultsArray = [Post]()
for post in posts.children {
let post = Post(snapshot: post as! FIRDataSnapshot)
resultsArray.append(post)
}
completion(resultsArray)
}) { (error) in
print(error.localizedDescription)
}
}
here is the fetchAllPosts function in the homeViewController
private func fetchAllPosts(){
authService.fetchAllPosts {(posts) in
self.postsArray = posts
self.postsArray.sort(by: { (post1, post2) -> Bool in
Int(post1.postDate) > Int(post2.postDate)
})
self.tableView.reloadData()
}
}
Here is my post structure in my swift file:
struct Post {
var username: String!
var uid: String!
var postId: String!
var type: String
var postText: String
var postTit: String
var postPicUrl: String!
var postDate: NSNumber!
var ref: FIRDatabaseReference!
var key: String = ""
init(postId: String,postText: String, postTit:String, postDate:NSNumber, postPicUrl: String?, type:String, uid: String, key: String = ""){
self.postText = postText
self.postTit = postTit
self.postPicUrl = postPicUrl
self.type = type
self.uid = uid
self.postDate = postDate
self.postId = postId
}
init(snapshot: FIRDataSnapshot){
self.ref = snapshot.ref
self.key = snapshot.key
self.postId = (snapshot.value! as! NSDictionary)["postId"] as! String
self.type = (snapshot.value! as! NSDictionary)["type"] as! String
self.postPicUrl = (snapshot.value! as! NSDictionary)["postPicUrl"] as! String
self.postDate = (snapshot.value! as! NSDictionary)["postDate"] as! NSNumber
self.postTit = (snapshot.value! as! NSDictionary)["postTit"] as! String
self.uid = (snapshot.value! as! NSDictionary)["uid"] as! String
self.postText = (snapshot.value! as! NSDictionary)["postText"] as! String
}
func toAnyObject() -> [String: Any] {
return ["postId":self.postId,"type":self.type, "postPicUrl":self.postPicUrl,"postDate":self.postDate, "postTit":self.postTit,"uid": self.uid, "postText":self.postText,]
}
}
Did you use this;
postRef.queryOrdered(byChild: "uid").queryEqual(toValue: yourUid).observe(.value, with: {
snapshot in
if let shot = snapshot {
let post = Post(snapshot: post as! FIRDataSnapshot)
}
}
This returns data you are looking for.
I've been attempting to utilize firebase's snapshots, but when I try to access specific children, the output is a null.
var ref = FIRDatabaseReference.init()
func loadData {
ref = FIRDatabase.database().reference(
ref.child("Posts").child(postId).observeSingleEventOfType(.Value, withBlock: { snapshot in
print(snapshot.value?["PostText"] as! String) // Optional(<null>)
print(snapshot)
for child in snapshot.children {
if child.childSnapshotForPath("PostText").value == nil {
self.postText.text = ""
} else {
self.postText.text = child.childSnapshotForPath("PostText").value as? String // Optional(<null>)
print(child.childSnapshotForPath("PostText").value)
}
}
})
}
Output of print(snapshot)
Snap (84844) {
Author = lGAV1KUhSCP8hnFiKY1N9lBPrmmst1;
CommentsCount = 1;
Group = 665555;
ImageUrl = "http://i.telegraph.co.uk/multimedia/archive/03589/Wellcome_Image_Awa_3589699k.jpg";
PostText = "I like cakeh, but theijijijijijij truth is, it's too sweet. So SOMETIMES I dont eat it, but i LIKE CAKE.";
}
It looks like your snapshot is a Dictionary. Then you have to cast it as a Dictionary:
func loadData {
ref = FIRDatabase.database().reference(
ref.child("Posts").child(postId).observeSingleEventOfType(.Value, withBlock: { snapshot in
print(snapshot.value?["PostText"] as! String) // Optional(<null>)
print(snapshot)
let dict = snapshot.value as! Dictionary<String, AnyObject>
if let author = dict["Author"] as? String, commentsCount = dict["CommentsCount"] as? Int, group = dict["Group"] as? Int {
print("author \(author) commentsCount \(commentsCount), group: \(group)")
}
})
}
Do the same for ImageUrl and PostText, they should be cast as String